Molding-machine.



PATBNTBD PEB. 25, 1908.

E. J.' SCHRQDER.' MOLDING MACHINE.

.APPLICATION FILED HOV. 11l 1907.

2 SHEETS-SHEET 1.

n ALA )I-xlventor Witnesses t @Nvu/U (RS m. 54%

a; Attoriiey E. 1. soHRoDER.

MOLDING MACHINE.

APPLIUATION 911111111101191. 1907.

9 SHEETS-s111131' 2.

PATEN'I'ED FEB. 25, 1908.

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Wtnses: @www W l 0. u). i351 h1 Attorney UNITED sTATEs PATENT oEEIoE.

EDW N J'. S 01H0.

To all 'whom 'it may concern.

Be it known that I, EDWIN J. SCHRODER, a citizen of the United States, residing at Hamilton, Butler county, Ohio, have invented Acertain new and useful Im rovements in Molding-Machines, of which t e following is a s ecilication..

his invention, pertaining to im rovements in molding machines applicab e, for

instance, to the production of cylindrical or.

` same in the lane of line a of Fig. 2: and Fig.

5 a vertical ongitudinal section of the mold and its immediate accessories when adapted.

for the production of completely cylindrical objects.

In the drawings :-1, indicates an upright support, which may, if desired, be a column in a building: 2, a vertically disposed cylin- 1 drical mold ixedly secured to the support and having a diameter and length a propriate to the articles to be molded: 3,'a nlng disposed separably therein and rovlded for convenient re airs: 4, a cylinderead closing the lower en of the mold, the upper end of the mold being open: 5, a funnel-ring secured upon the upper end of the mold: 6, a piston fitting the mold: 7 ,a cylindrical core proj ecting rigidly up from the piston and having a diameter a propriate to the internal diameter of the ojects to be molded, and having such length that its upper end will (project somewhat above the top of the mol when the piston is at the lower end of the mold: 8, a separa-ble hollow shell forming the body of the core; 9, a piston-rod rigidly secured to the piston and projecting upwardly therefrom through the core shell 8 and projecting u wardly for a considerable distance above t e Aupper end of the core, the portion of the outer extremities of these wings closely t' Specification of Letters Patent.

y pulman ma November 11. 1907. serial No. 401.545.

Patented Feb. 2u, 1908.

ting the interior of the mold: 12, a piston-rod guide carried by the support at such distance above the top of the mold as'to ermit the piston to rise to the top of the mo d: 13, a screw carried by the guide 12 and having its point engaging the spline of the pistonrod so that the core is revented from turning: 14, a pair of thin b ades lying upon and pivoted to the top of the mold and adapted, when swung to inward position, to close the ,upper end of the mold around the core: 15, a su ply tank containing a supply of liquid or use in .operating the machine: 16, a ump connected with the supply tank and a a ted to withdraw liquid from the tank an discharge it under pressure: 17, an accumulator connected with the discharge pressure pump 16 so as to be supplied thereby with liquid under pressure: 18, an inlet and outlet connection at the lower end of the mold, the mold being connected with the discharge from the accumulator: 19', an ordinary 'three-way valve disposed in the pipe-connection between the mold and the accumulator, in such manner that the mold may be placed in communication with' lthe accumulator, or, alternately, withv a point of discharge from the mold: 20, .an ord nary pressure-reducing valve disposed in the connection .between the three-way valve and the accumulator: 21, a pump having its discharge' connected with supply tank 15, and having its inlet connected with' the outlet branch of the three-way Valve: 22, a vacuum tank disposed inthe connection between-vacuum pum 2] andthe mold: 23, an?

operating rod for t e three-way valve', this rod' beingdisposed vertically alongside the piston-rod: 24, an adjustable collar on the valve-rod: 25, a tappet carried by the piston' and maintains'pressure inthe accumulator.

`The accumulator discharges to the mold through reducing valve'20 when the threeway valve is properly adjusted, and such pressure'cause" the moldpiston and core to rise. The vacuum pump' 21 maintains par-l tial Vacuumin vacuum tank 22, and when the three-'way valv'e is roperly adjusted th piston and core descend) aided bythe vacuum, the liquid discharglng' bytheir own weight from the mold and bein delivered again to the su ply tank by t e vacuum ump. When tile three-way valve has been adjusted to pro er position and the pressure admitted elow the piston, the piston rises till the tappet strikes the collar 24, thus shifting the valve and cutting off the further inilow of liquid under the piston. A further adjustment of the valve causes the liquidto be sucked out from under the piston and the piston and core `to descend, the descent ceasing when the tap et strikes collar 26.

Turning to Fig. 2 o the drawings, in using the machine the piston and core are to iirst be in their lower position, as shown, and the blades 14 are to be open. The mold is then to be lled with the plastic material, and after the material has set then the valve is to be adjusted toadmit pressure under the piston, whereupon the iston and core rise in the mold and force t e molded article up out of the mold. The blades are then closed in under the molded article and the piston and core are allowed to descend, leaving the molded article supported by the blades. The molded article being formed in two halves, by reason of the action of the wings 11, can be readily removed from the machine and ,after the blades are again opened, the machine is ready for a new charge. of plastic material.

It is not always that the molded article is .Wanted in divided form and, in such case the upper portion. of the piston-rod, and its guide, and the tappet, would interfere with convenient removal of the molded article. When integral'instead of divided articles are to be molded then the wings are omitted from thecore, and the piston-rod may project below instead of above the mold, as indicated in Fig. 5, thus rovidin for the readyl removalof undivided molde articles.

I claim 1. A molding machine comprising avertically disposed mold closed at 'its lower end and open at its upper end, a piston adapted to reciprocate therein, a core projecting upwardly from the piston, means for raising and lowering the piston and core in the mold,

mold and adapted to be entered between the top of the piston and the base of a molded article' supported thereon, combined substantially as set forth.

2. A molding machine com rising a vertically dis osed cylindrical mo d closed at its lower eng and open at its upper end, a; piston adapted to reciprocate therein, a eyli'iidrical core projecting upwardly from the piston',

means for raising and lowering; the piston and core in the mold, and a blade movably mounted at the top of the mold; and adapted to be entered between the top ofthe piston and the base of a molded.- article supported thereon, combined substantially as, set forth.

A molding machine comprising a vertically disposed mold closed at 'its lower end and open at its upper end, a piston adapted to reciprocate therein, a core projecting upwardly from the piston, wings projecting lrigidly outward from the core and extending lengthwise thereof and engaging the bore of the mold so as to divide the same into several compartments, means for raising and lowering the piston and core in the mold, and a blade movably mounted at the top of the mold and adapted to be entered between the top of the piston and the base of the molded article supported thereon, combined substantially as set forth.

4.' A molding machine comprising a vertically disposed mold closed at its lower end and open at its upper end, a piston adapted to reciprocate therein, a core projecting upwardly from the piston, means for raising and lowering the piston and core in the mold, and a pair of blades pivotally mounted at the top of the mold and adapted to beentered between the top of the piston and the base of a molded article supported thereon, combined substantiall as set forth.

5. A molding machine comprising a vertically disposed mold closed at its 'lower end and open at its upper end, a piston adapted to reciprocate therein, a core projecting upwardly from the piston, means for injecting cally disposed moldA closed at its lower end and open at its upper end, a piston adapted to reciprocate therein, a core projecting upwardlyyfrom the piston, means for injecting,D

liquid under pressure into the mold below the piston, suction means for removing the liquid rom below the piston, and a blade movably mounted at the top of the mold and adapted to be entered between the top -of the piston and' the base of a molded article supported thereon, combined substantially as set forth. and a movable blade for use -at the top of the 7. A molding machine comprising a vertically disposed mold closed at its lower end and open at its'upper end, a piston adapted to reciprocate therein, a core projecting up.-

jecting from the iston, a guide for said piston-rod independp raising and lowering the piston and core.. in the mold, and a blade movably mounted at the to of the mold and adapted to -be entered' etween the top of the piston and the base of a molded article supported thereon, combined substantially as set forth.

v wardly from the piston, a piston-rod pro-- I2() ent of the core, means for 8. A molding machine comprising a vertically disposed mold closed at its lower end and open at its upper end, a piston adapted to reciprocate therein, a core projecting upwardly from the piston, a three-way valve connected with the lower end of the mold,

' mechanism for delivering liquid under pressure to the mold through said three-way valve, mechanism for producing a partial vacuum in the mold through the three-way valve, and a blade movably mounted at the wardly from the piston, a va top of the mold audadapted to be entered between the top of the piston and the base of 'a' molded article supported thereon, combined substantially as set forth. 9. Amolding machine comprising a vertically disposed mold closed at its lower end and open at its upper end, a piston adapted to reciprocate therein, a core projecting upp ve for admitting pressure liquid to and permitting its discharge from the lower end of the mold, a valve-rod connected with said valve, an adjustable collar on the valve-rod, a tappet moving with the core and piston and adaptedto engage said collar and arrest the admission of liquid when the core and iston reach a predetermined height, and a lade movably mounted at the top of the mold and adapted to be entered between the top 'of the piston and the base of a molded article supported thereon, combined substantially asset forth.

v 10. A molding machine comprising a vertically disposed mold closed at its lower end and open at itsl upper end, a piston adapted to reclprocate therein, a core projecting upwardly from the piston, mechanism and pipeconnections for producing and conve ng liquid under pressure to the lower end o the mold, mechanism and ipe-connections for withdrawing theli uid om the lower'end of the mold, and ava vular device, for controlling the flow of liquid to and from the mold, combined substantiall Y as set forth.

11. A molding mac `ne comprising a vertically disposed mold closed 4at its lower end and open at its upper end, a piston adapted to reciprocate therein, a core projecting upwardly from the piston, an accumulator connected with the lower end of the mold and with a source of supply for li uid under pressure, a tank connected with t e lower end of the mold and with mechanism for (producing a partial vacuum in the tank, an valvular mechanism for controlling the ow of liquid to and from the mold.

12. A molding machine comprising a veri 4 `:as

umutank, and valvular mechanism for controlling the flowof liquid to and from the mold, combined substantiallv as set forth. EDWIN J. SCHRDER.

Witnesses:

M. S. BLDEN, E. R. SHIPLEY.

tank to the lower end of the l' 

